Wednesday, June 9, 2010

Exam Review Study Notes (June 9' 10)

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300 ugly kids were asked what is their favourite colour. How many like blue, how many like green, and how many like gold.

Blue:
25/100 = 75/100 or 25% of 300
(x3)
0.25 x 300 = 75

Green:

30/100 = 90/100 or 30% of 300
(x3)
0.3 x 300 = 75


Gold:

45/100 = 135/100 or 45% of 300
(x3)
0.45 x 300 = 135



What is the estimated ratio of the circumference to diameter.
3.14 : 1


Find the circumference when radius is 6cm.
2r = d c=2Лr
2(6) = d c = 2 (3.14) (6)
12 = d or c = 6.2816
c = Л d c = 37.68cm c = 3.14 (12) c = 37.68 cm


Find area when diameter is 1om.
r = d/2
r = 10/2

r = 5m

a = Л r 2
a = 3.14 x 5²
a = 3.14 x 25
a = 705 m²

The measure of a sector is 20% of the data.
What is the central angle for this sector?
20% of 360°
0.2 x 360° = 72°

The central angle 198° what percentage the circle represents?

(divide)
316 198/360 = 55/100

(─316)

I have a pool with a radius of 6m.
My yard is 30m long by 15m, how much space do I have left in my yard?

A yard L x W
= 15 x
= 450 m²
A pool = Л r²
= 3.14 (6)
= 3.14(36)
30 m
= 113.04 m²
450 - 113161 = 336.96m²






STUDY FOR YOU EXAMS!!

14 comments:

  1. Good job Justin!
    I like the images you used, especially the one with the yard and pool. Everything was nice and organized, i suggested to use more color on the font. But anyways, keep up the good work!

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  2. Good job Justin! It's very organized and the photos are great(Did you get one from webkinz for the pool in the yard?) Thanks for the video that can help us for the exams. Next time, put a little bit more colour. ☺

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  3. Awesome Job Justin! I thought your post was very neat and organized. I really liked how you remembered to add the video and image, next time remember the link also. I also think put more color. I can see that you put "300 ugly kids" in small font, I thought that was very smart. (:

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  4. Awesomne Job Justin!! I lied how you used nice pictures that described what we did and how you explained everything. Next time you should try and out more color, and make the font BIGGER.

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  5. Good Job Justin, I liked your picture and the video. I also liked how you made your post organized and easy to read. Good JoB.

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  6. Good job, Justin. The pictures and videos were great.
    I think the font should be bigger and more .. bolder.

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  7. Good job Justin, I like your picture and your video. I think you will need to make the font more bigger and bolder.

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  8. Nice job Justin, the pictures and the video but next time put more colors into it.

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  9. Good job, picture was great and next time try out more colours and a bit bigger.

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  10. Good job Justin, it's neatly done. Great video, picture and next time a link (: but still great job.

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  11. Good job Justin ! it very neatly done. Great video, picture and next time please put in a link (: but overall nice job .

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  12. Nice job Justin! The images were great and I especialy like the one that looks virtualy.Next time try to add a link but overall it was good.

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  13. Good job. I liked the picture, and the video. Maybe add some more colour.

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